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Another System Definition Facility — de facto standard build system for Common Lisp software. Includes UIOP, the Utilities for Implementation- and OS- Portability, a library to make possible the portable development of CL software.

CMUCL is a high-performance, free Common Lisp implementation which runs on most major Unix platforms.

ANSI Common Lisp conformity test suite. Optionally it tests some other extensions.

An updated version of the first widely available (and quite portable) DEFSYSTEM for Common Lisp

CL-SMTP is a simple lisp smtp client. It works in ACL, SBCL, CMUCL, OPENMCL, LISPWORKS, CLISP and ECL.

ACL-like layer for AllegroServe porting.